diff options
Diffstat (limited to 'libc/string/strstr.c')
-rw-r--r-- | libc/string/strstr.c | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/libc/string/strstr.c b/libc/string/strstr.c deleted file mode 100644 index 6aa448787..000000000 --- a/libc/string/strstr.c +++ /dev/null @@ -1,137 +0,0 @@ -/* Return the offset of one string within another. - Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Library General Public License as - published by the Free Software Foundation; either version 2 of the - License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Library General Public License for more details. - - You should have received a copy of the GNU Library General Public - License along with the GNU C Library; see the file COPYING.LIB. If not, - write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -/* - * My personal strstr() implementation that beats most other algorithms. - * Until someone tells me otherwise, I assume that this is the - * fastest implementation of strstr() in C. - * I deliberately chose not to comment it. You should have at least - * as much fun trying to understand it, as I had to write it :-). - * - * Stephen R. van den Berg, berg@pool.informatik.rwth-aachen.de */ -/* added strcasestr support, davidm@lineo.com */ - -#if HAVE_CONFIG_H -# include <config.h> -#endif - -#if defined _LIBC || defined HAVE_STRING_H -# include <string.h> -#endif - -typedef unsigned chartype; - -#if defined(L_strstr) - -#define VAL(x) (x) -#define FUNC strstr -#undef strstr - -#elif defined(L_strcasestr) - -#include <ctype.h> -#define VAL(x) tolower(x) -#define FUNC strcasestr -#undef strcasestr - -#else - -#error "No target function defined." - -#endif - -char * FUNC ( const char *phaystack, const char *pneedle) -{ - register const unsigned char *haystack, *needle; - register chartype b, c; - - haystack = (const unsigned char *) phaystack; - needle = (const unsigned char *) pneedle; - - b = *needle; - if (b != '\0') { - haystack--; /* possible ANSI violation */ - do { - c = *++haystack; - if (c == '\0') - goto ret0; - } - while (VAL(c) != VAL(b)); - - c = *++needle; - if (c == '\0') - goto foundneedle; - ++needle; - goto jin; - - for (;;) { - register chartype a; - register const unsigned char *rhaystack, *rneedle; - - do { - a = *++haystack; - if (a == '\0') - goto ret0; - if (VAL(a) == VAL(b)) - break; - a = *++haystack; - if (a == '\0') - goto ret0; - shloop: - ; - } - while (VAL(a) != VAL(b)); - - jin:a = *++haystack; - if (a == '\0') - goto ret0; - - if (VAL(a) != VAL(c)) - goto shloop; - - rhaystack = haystack-- + 1; - rneedle = needle; - a = *rneedle; - - if (VAL(*rhaystack) == VAL(a)) - do { - if (a == '\0') - goto foundneedle; - ++rhaystack; - a = *++needle; - if (VAL(*rhaystack) != VAL(a)) - break; - if (a == '\0') - goto foundneedle; - ++rhaystack; - a = *++needle; - } - while (VAL(*rhaystack) == VAL(a)); - - needle = rneedle; /* took the register-poor approach */ - - if (a == '\0') - break; - } - } - foundneedle: - return (char *) haystack; - ret0: - return 0; -} |